A kind of organophosphate zinc-silane composite passivation film modified zinc metal negative electrode and its preparation method and application

A technology of organic zinc phosphate and zinc metal, applied in the direction of negative electrode, electrode manufacturing, active material electrode, etc., can solve the problems that hinder the development and application of aqueous zinc-ion batteries, the decline of Coulombic efficiency and cycle stability, and the attenuation of battery capacity. Achieve the effects of inhibiting hydrogen evolution corrosion, enhancing desolvation effect, and improving performance

Active Publication Date: 2021-12-31
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, during the battery cycle of zinc-ion secondary batteries, metal zinc anodes face problems such as surface dendrite growth, slow corrosion and passivation, and inevitable hydrogen evolution, resulting in battery capacity attenuation, Coulombic efficiency and cycle stability, and volume. Swelling, and even dendrites piercing the separator to cause a short circuit, bringing safety issues, etc., seriously hindering the development and application of aqueous zinc-ion batteries

Method used

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  • A kind of organophosphate zinc-silane composite passivation film modified zinc metal negative electrode and its preparation method and application
  • A kind of organophosphate zinc-silane composite passivation film modified zinc metal negative electrode and its preparation method and application
  • A kind of organophosphate zinc-silane composite passivation film modified zinc metal negative electrode and its preparation method and application

Examples

Experimental program
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Effect test

Embodiment 1

[0040] First prepare the zinc metal disc to be modified: take a commercial zinc sheet with a certain size and a thickness of 0.1mm, and then use a punching machine to punch it into a disc with a diameter of 16mm, and then punch the zinc sheet after punching Use a heavy object to press the surface until it is flat, and then ultrasonically clean the flattened zinc sheet with ultrapure water and ethanol for 10 minutes, and then put it in a vacuum oven at 30°C to dry it for use.

[0041] Weigh 0.27g of hydroxyethylidene diphosphonic acid into a beaker containing 50mL of distilled water and stir to fully dissolve it, which is recorded as solution A. Weigh 0.2g of methyltriethoxysilane into a beaker containing 10mL of absolute ethanol Stir to fully dissolve it, record it as solution B, slowly add solution B dropwise to solution A under rapid stirring conditions, mix well, place it in a water bath at 75°C, heat for 3 hours under slow stirring conditions, and take it out after 3 hours ...

Embodiment 2

[0043] This embodiment carries out similar parallel test with embodiment 1, wherein the concentration of hydroxyethylidene diphosphonic acid aqueous solution is 2.5g / L, other preparation methods are exactly the same as embodiment 1, obtain organophosphate zinc-silane composite passivation film Modified zinc metal anode.

Embodiment 3

[0045] The present embodiment carries out similar parallel test with embodiment 1, 2, wherein the mass concentration of methyltriethoxysilane organic solution is 8g / L, other other preparation methods are exactly the same as embodiment 1, obtain organophosphate zinc- Silane composite passivation film modified zinc metal anode.

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Abstract

The invention relates to the technical field of water-based zinc-ion batteries, in particular to a zinc metal negative electrode modified with an organophosphate zinc-silane composite passivation film and a preparation method and application thereof. The preparation method is to use the characteristic of silane coupling agent to be hydrolyzed into silanol in water, mix the silane coupling agent and organic phosphoric acid chelating agent evenly, add metal zinc to undergo a chemical reaction, and generate in situ on the surface of the zinc metal negative electrode An organophosphate zinc chelate-silane composite passivation film to obtain a modified zinc metal negative electrode. Applying the modified zinc metal negative electrode material of the present invention to an aqueous zinc-ion battery system can significantly inhibit the uncontrollable dendrite growth of the zinc metal negative electrode, inhibit the loss of electrolyte caused by hydrogen evolution corrosion and side reactions, and greatly prolong the life of the zinc-ion battery. cycle life.

Description

technical field [0001] The invention relates to the technical field of water-based zinc-ion batteries, in particular to an organic zinc-silane composite passivation film-modified zinc metal negative electrode, a preparation method and application thereof. Background technique [0002] Metal zinc has abundant reserves in nature, low equilibrium potential, high hydrogen overpotential, and high theoretical capacity (820 mA h / g). Zinc has the highest energy among metal elements stable in aqueous solution, and also has redox potential Low (-0.76V), environmentally friendly and many other advantages. [0003] During the electrochemical reaction of zinc-ion batteries, zinc ions can carry more free charges. In theory, it has a higher energy density than lithium-ion batteries. Under the same discharge capacity, the positive electrode material can deintercalate fewer ions, thus The crystal structure of the material is not easy to be destroyed, which ensures the good stability of the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/04H01M4/38H01M4/62H01M10/38
CPCH01M4/0402H01M4/62H01M4/628H01M4/366H01M4/38H01M10/38H01M2004/027Y02P70/50Y02E60/10
Inventor 陈月皎于铧铭陈立宝刘文王寒
Owner CENT SOUTH UNIV
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